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Installed Codeigniter constants in custom library

I am using codeigniter for a project. I have a custom library that has constants that I will use in my custom functions in the library. How do you declare such constants?

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If you are only going to use these constants in your library, you must declare it inside your class:

<?php
class my_class {
    const MY_CONSTANT = 10;

And then call it with:



self::MY_CONSTANT

If you need your constants to be available in the rest of the application, you must declare it in your application/config/constants.php

file

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Usually Codeigniter constants should be inside config/constants.php

. Then only we can access all constants in the entire application.



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You can create your own constants file and just include it in your library:

config / myconstants.php

In your library

enable (APPPATH. 'config / myconstants.php');

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Accessing a constant in a library this way. It works.

 $this->load->library('library_name');
 echo library_name::MY_CONSTANT;
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You must declare constants config/constants.php

like this:

class MyConstantsClass {

    public static function get_timezones_list() {
        return array(
            "-12" => "(GMT -12:00) Eniwetok, Kwajalein",
            "-11" => "(GMT -11:00) Midway Island, Samoa",
            "-10" => "(GMT -10:00) Hawaii",
            "-9" => "(GMT -9:00) Alaska",
            "-8" => "(GMT -8:00) Pacific Time (US &amp; Canada)",
            "-7" => "(GMT -7:00) Mountain Time (US &amp; Canada)",
            "-6" => "(GMT -6:00) Central Time (US &amp; Canada), Mexico City",
            "-5" => "(GMT -5:00) Eastern Time (US &amp; Canada), Bogota, Lima",
            "-4" => "(GMT -4:00) Atlantic Time (Canada), Caracas, La Paz",
            "-3.5" => "(GMT -3:30) Newfoundland",
            "-3" => "(GMT -3:00) Brazil, Buenos Aires, Georgetown",
            "-2" => "(GMT -2:00) Mid-Atlantic",
            "-1" => "(GMT -1:00) Azores, Cape Verde Islands",
            "0" => "(GMT) Western Europe Time, London, Lisbon, Casablanca",
            "1" => "(GMT +1:00) Brussels, Copenhagen, Madrid, Paris",
            "2" => "(GMT +2:00) Kaliningrad, South Africa",
            "3" => "(GMT +3:00) Baghdad, Riyadh, Moscow, St. Petersburg",
            "3.5" => "(GMT +3:30) Tehran",
            "4" => "(GMT +4:00) Abu Dhabi, Muscat, Baku, Tbilisi",
            "4.5" => "(GMT +4:30) Kabul",
            "5" => "(GMT +5:00) Ekaterinburg, Islamabad, Karachi, Tashkent",
            "5.5" => "(GMT +5:30) Bombay, Calcutta, Madras, New Delhi",
            "6" => "(GMT +6:00) Almaty, Dhaka, Colombo",
            "7" => "(GMT +7:00) Bangkok, Hanoi, Jakarta",
            "8" => "(GMT +8:00) Beijing, Perth, Singapore, Hong Kong",
            "9" => "(GMT +9:00) Tokyo, Seoul, Osaka, Sapporo, Yakutsk",
            "9.5" => "(GMT +9:30) Adelaide, Darwin",
            "10" => "(GMT +10:00) Eastern Australia, Guam, Vladivostok",
            "11" => "(GMT +11:00) Magadan, Solomon Islands, New Caledonia",
            "12" => "(GMT +12:00) Auckland, Wellington, Fiji, Kamchatka"
        );
    }   

    public static function get_codes() {        
        return array();
    }

   // .... and so on....

}

Then in your custom library:

class MyLibraryClass {

    private $timezones;

    public function __construct(){
        $this->CI =& get_instance(); //in case you need it
        $this->timezones = MyConstantsClass::get_timezones_list();
    }

    //do whatever you want with your constants
    echo $current_timezone = $this->timezones['-5']; //print (GMT -5:00) Eastern Time (US &amp; Canada), Bogota, Lima

}
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